Thank you for your hints. I solved the promble. First, NoesisGUI render GUI on Camera's OnPostRender(); GL render lines or other thins on GameObject's OnRenderObject(); Accoring Unity's official document: OnRenderObject: Called after all regular scene rendering is done. OnPostRender: Called after a ...

When I use GL to render some line in OnRenderObject(),get some unexpected screen as below. snipaste20210315_233934.jpg snipaste20210315_234029.jpg Red Block is cursor render by GL. In the second pic, the red block is front of NoesisUI, but hidden by door. And the door is hidden by NoesisUI. I think ...